[roll] Roll fuchsia [fx][gnerator] Introduce fx gnerator

For syncing BUILD.bazel and BUILD.gn of targets that are dual-building.

Ran it to:

* Sync targets for gnerator itself
* Sync targets for device-finder and all of its recursive deps

Note more granular GN targets are needed in //third_party/golibs. They
are manually added, and will be automatically picked up and maintained
by update.sh.

Bazel build tested locally with:

fx bazel build --platforms=@platforms//host --@io_bazel_rules_go//go/config:linkmode=pie //tools/net/device-finder:all

GN build is continuously tested in CI/CQ.

Original-Bug: 375286604

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1148373
Original-Revision: 829702b63162038743111a69d849edd9408c06e7
GitOrigin-RevId: 2458c32e9682c97ea19f2fd754d8f3375a1ad097
Change-Id: I7f136ea3a8343f86695c8c19c1e7eb5d10cbd3e4

Author: Jay Zhuang

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="93a8bf985df428b2cab0c38422ee951ca1044c9a"/>
+             revision="829702b63162038743111a69d849edd9408c06e7"/>
   </projects>
   <hooks>
     <hook name="install-environment"